__kernel void sepiaFilterKernel(
		__global const unsigned char* in,
		__global unsigned char* out,
		int count)
{
	int i = get_global_id(0);
	if(i < count) {

		unsigned char b = in[i * 4];
		unsigned char g = in[i * 4 + 1];
		unsigned char r = in[i * 4 + 2];

		double sepiaR = (r * 0.393) + (g * 0.769) + (b * 0.189);
		double sepiaG = (r * 0.349) + (g * 0.686) + (b * 0.168);
		double sepiaB = (r * 0.272) + (g * 0.534) + (b * 0.131);

		if (sepiaR > 255) sepiaR = 255;
		if (sepiaG > 255) sepiaG = 255;
		if (sepiaB > 255) sepiaB = 255;
		if (sepiaR < 0) sepiaR = 0;
		if (sepiaG < 0) sepiaG = 0;
		if (sepiaB < 0) sepiaB = 0;

		out[i * 4] = (char)sepiaB;
		out[i * 4 + 1] = (char)sepiaG;
		out[i * 4 + 2] = (char)sepiaR;
		out[i * 4 + 3] = in[i * 4 + 3];
	}
}